<%--
  Created by IntelliJ IDEA.
  User: hasee
  Date: 2021/6/8
  Time: 9:48
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%--分页条的开始--%>
<div id="page_nav">
    <%--如果是第一页，则不显示首页，上一页--%>
    <c:if test="${requestScope.page.pageNo>1}">
        <a href="${requestScope.page.url}&pageNo=1">首页</a>
        <a href="${requestScope.page.url}&pageNo=${requestScope.page.pageNo-1}">上一页</a>
    </c:if>
    <%--页码输出的开始--%>
    <c:choose>
        <%--情况1：如果总页码小于等于5的情况，页码的范围是：1-总页码--%>
        <c:when test="${requestScope.page.pageTotal<=5}">
            <c:set var="begin" value="1"/>
            <c:set var="end"  value="${requestScope.page.pageTotal}"/>

        </c:when>
        <%--情况2：如果总页码大于5的情况，假设一共有10页--%>
        <c:when test="${requestScope.page.pageTotal>5}"	>
            <c:choose>
                <%--小情况 1：当前页码为前面 3 个：1，2，3 的情况，页码范围是：1-5.--%>

                <c:when test="${requestScope.page.pageNo<=3}">
                    <c:set var="begin" value="1"/>
                    <c:set var="end"  value="5"/>
                </c:when>

                <%--小情况 2：当前页码为最后 3 个，8，9，10，页码范围是：总页码减 4 - 总页码--%>
                <c:when test="${requestScope.page.pageNo>requestScope.page.pageTotal-3}">
                    <c:set var="begin" value="${requestScope.page.pageTotal-4}"/>
                    <c:set var="end"  value="${requestScope.page.pageTotal}"/>

                </c:when>

                <%--小情况 3：4，5，6，7，页码范围是：当前页码减 2 - 当前页码加 2--%>
                <c:otherwise>
                    <c:set var="begin" value="${requestScope.page.pageNo-2}"/>
                    <c:set var="end"  value="${requestScope.page.pageNo+2}"/>
                </c:otherwise>
            </c:choose>
        </c:when>

    </c:choose>

    <c:forEach begin="${begin}" end="${end}" var="i">
        <c:if test="${i==requestScope.page.pageNo}">
            【${i}】
        </c:if>
        <c:if test="${i!=requestScope.page.pageNo}">
            <a href="${requestScope.page.url}&pageNo=${i}">${i}</a>
        </c:if>
    </c:forEach>
    <%--页码输出的结束--%>

    <%--如果已经是最后一页，则不显示下一页，末页--%>
    <c:if test="${requestScope.page.pageNo<requestScope.page.pageTotal}">
        <a href="${requestScope.page.url}&pageNo=${requestScope.page.pageNo+1}">下一页</a>
        <a href="${requestScope.page.url}&pageNo=${requestScope.page.pageTotal}">末页</a>
    </c:if>

    共${requestScope.page.pageTotal}页，${requestScope.page.getPageTotalCount}条记录
    到第<input value="${requestScope.page.pageNo}" name="pn" id="pn_input"/>页
    <input id="searchPageBtn" type="button" value="确定">
    <script type="text/javascript">
        $(function () {
            //跳到指定的页码
            $("#searchPageBtn").click(function () {
                var pageNo=$("#pn_input").val();
                var pageTotal=${requestScope.page.pageTotal};
                //javaScript语言中提供了一个location地址栏对象
                //它有一个属性叫href，它可以获取浏览器中地址栏的地址
                //href属性可读可写
                location.href="${pageScope.basePath}${requestScope.page.url}&pageNo="+pageNo;
            })
        })
    </script>
</div>
<%--分页条的结束--%>